.placeholder {
    height: 88px;
}
/*导航栏*/
.header {
    position: fixed;
    top: 0;
    left: 0;
    z-index: 100;
    width: 100%;
}

.header header {
    width: 100%;
    height: 88px;
    display: flex;
    padding: 0 30px;
    justify-content: center;
    align-items: center;
    background-color: #fff;
    width: 100%;
    box-sizing: border-box;
    position: relative;
    top: 0;
    left: 0;
    font-size: 32px;
    color: #333;
    font-weight: 900;
}

.header_return {
    width: 25px;
    height: 100%;
    position: absolute;
    top: 0px;
    left: 30px;
    display: flex;
    align-items: center;
}

.header_return > img {
    width: 25px;
    height: 44px;
}

.header_btn {
    position: absolute;
    top: 0;
    right: 30px;
    height: 100%;
    display: flex;
    justify-content: flex-end;
    align-items: center;
    font-size: 30px;
    color: @react_base_color;
    font-weight: 900;
}